Bump version: 2.13.0 → 2.13.1 (honeycombio#128)

Release version 2.13.0

Release version 2.12.2

Run workflow on tags instead of just branches

bump to 2.12.1

bump to 2.12.0

Merge pull request honeycombio#98 from honeycombio/travis.double-spans

[requests] anchor trace context to child span in requests wrapper

Merge pull request honeycombio#97 from honeycombio/tredman.bump

Add type safety checking in add_trace_field, bump version

Merge pull request honeycombio#93 from honeycombio/travis.context-fix

remove strict requirement for 3+ trace header fields

bump to 2.11.1